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RRehmanniae radix, Retama raetam, Rhazya stricta, Rheedia gardneriana, Rhizoma alismatis, Rhizophora mangle, Rhus hirta, Rubus imperialis, Ruscus aculeatus

Rehmanniae radix

Taxonomy: Kingdom : Plantae

Division : Magnoliophyta

Class : Magnoliopsida

Order : Lamiales

Family : scrophulariaceae

Genus : Rehmanniae.rad

Chemical Constituents:

Furfural disaccharide 5-(alpha-D-glucopyranosyl-(1-->6)-alpha-D-glucopyranosyloxymethyl)-2-furancarboxaldehyd, Aglycone 5-hydroxymethyl-2-furfural,5-(alpha-D-glucopyranosyloxymethyl)-2-furancarboxaldehyde, Catalpol and 5-Hydroxy methyl-2-furaldehyde (5-HMF)

Part used : rhizome, bark

Reference:

Chemical Constitutents :

Effect of concentration of catalpol and 5-hydroxymethyl-2-furaldehyde from processing of Rehmanniae Radix] http://www.ncbi.nlm.nih.gov/pubmed/17802874
5-Hydroxymethyl-2-furfural, a clinical trials agent for sickle cell anemia, and its mono/di-glucosides from classically processed steamed Rehmanniae Radix. http://www.ncbi.nlm.nih.gov/pubmed/18404317

Anti hyperglycemic activity:

Extracts of Rehmanniae radix, Ginseng radix and Scutellariae radix improve glucose-stimulated insulin secretion and beta-cell proliferation through IRS2 induction. http://www.ncbi.nlm.nih.gov/pubmed/18850229
Amelioration of diabetic nephropathy by dried Rehmanniae Radix (Di Huang) extract. http://www.ncbi.nlm.nih.gov/pubmed/15673189